chr8-38413795-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2PP2

The NM_023110.3(FGFR1):c.2302G>C(p.Asp768His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,842 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D768N) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

FGFR1
NM_023110.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 7.91

Publications

1 publications found

Variant links:

Genes affected

FGFR1 (HGNC:3688): (fibroblast growth factor receptor 1) The protein encoded by this gene is a member of the fibroblast growth factor receptor (FGFR) family, where amino acid sequence is highly conserved between members and throughout evolution. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member binds both acidic and basic fibroblast growth factors and is involved in limb induction. Mutations in this gene have been associated with Pfeiffer syndrome, Jackson-Weiss syndrome, Antley-Bixler syndrome, osteoglophonic dysplasia, and autosomal dominant Kallmann syndrome 2. Chromosomal aberrations involving this gene are associated with stem cell myeloproliferative disorder and stem cell leukemia lymphoma syndrome. Alternatively spliced variants which encode different protein isoforms have been described; however, not all variants have been fully characterized. [provided by RefSeq, Jul 2008]

FGFR1 Gene-Disease associations (from GenCC):

encephalocraniocutaneous lipomatosis
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
Hartsfield-Bixler-Demyer syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P, ClinGen
hypogonadotropic hypogonadism 2 with or without anosmia
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
osteoglophonic dysplasia
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Orphanet, ClinGen, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
Pfeiffer syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
Pfeiffer syndrome type 1
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Jackson-Weiss syndrome
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
hypogonadotropic hypogonadism
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
isolated trigonocephaly
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Kallmann syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
septooptic dysplasia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
tooth agenesis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
holoprosencephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

FGFR1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the FGFR1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 93 curated pathogenic missense variants (we use a threshold of 10). The gene has 28 curated benign missense variants. Gene score misZ: 2.4852 (below the threshold of 3.09). Trascript score misZ: 4.2642 (above the threshold of 3.09). GenCC associations: The gene is linked to Hartsfield-Bixler-Demyer syndrome, Pfeiffer syndrome type 1, encephalocraniocutaneous lipomatosis, hypogonadotropic hypogonadism 2 with or without anosmia, osteoglophonic dysplasia, isolated trigonocephaly, septooptic dysplasia, Pfeiffer syndrome, tooth agenesis, hypogonadotropic hypogonadism, Kallmann syndrome, holoprosencephaly, Jackson-Weiss syndrome.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGFR1	NM_023110.3 link	c.2302G>C	p.Asp768His	missense_variant	Exon 18 of 18	ENST00000447712.7	NP_075598.2	P11362-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FGFR1	ENST00000447712.7 link	c.2302G>C	p.Asp768His	missense_variant	Exon 18 of 18	1	NM_023110.3	ENSP00000400162.2	P11362-1
FGFR1	ENST00000397091.9 link	c.2296G>C	p.Asp766His	missense_variant	Exon 18 of 18	1		ENSP00000380280.5	P11362-7
FGFR1	ENST00000397108.8 link	c.2296G>C	p.Asp766His	missense_variant	Exon 19 of 19	1		ENSP00000380297.4	P11362-7
FGFR1	ENST00000397113.6 link	c.2296G>C	p.Asp766His	missense_variant	Exon 18 of 18	2		ENSP00000380302.2	P11362-7
FGFR1	ENST00000356207.9 link	c.2035G>C	p.Asp679His	missense_variant	Exon 17 of 17	1		ENSP00000348537.5	P11362-3
FGFR1	ENST00000397103.5 link	c.2035G>C	p.Asp679His	missense_variant	Exon 16 of 16	5		ENSP00000380292.1	E7EU09
FGFR1	ENST00000326324.10 link	c.2029G>C	p.Asp677His	missense_variant	Exon 17 of 17	1		ENSP00000327229.6	P11362-14

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461842

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727214

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111988

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypogonadotropic hypogonadism 2 with or without anosmia

Uncertain:1

May 04, 2023

Reproductive Endocrine Unit, Massachusetts General Hospital

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Uncertain:1

Mar 22, 2019

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Identified in several patients with hypogonadotropic hypogonadism in published literature, including at least one individual with Kallman syndrome, but segregation information was either not provided or showed the variant in unaffected family members (Sykiotis et al., 2010; Quaynor et al., 2011; Shaw et al., 2011; Chan et al., 2014); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Not observed in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 20696889, 22035731, 25226293, 21209029) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

BayesDel_addAF

Pathogenic

0.44

BayesDel_noAF

Pathogenic

0.39

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.93

.;.;D;.;.;.;.;.;T;.

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.83

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

D;.;D;D;.;D;D;D;D;D

M_CAP

Pathogenic

0.42

MetaRNN

Uncertain

0.58

D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.63

MutationAssessor

Uncertain

2.8

.;.;M;.;.;.;.;.;.;.

PhyloP100

7.9

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-5.0

D;D;D;D;D;D;D;D;D;D

REVEL

Pathogenic

0.91

Sift

Uncertain

0.0070

D;D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.0090

D;D;D;D;D;D;D;D;D;D

Polyphen

0.99, 1.0

.;.;D;D;.;.;D;D;.;.

Vest4

0.67

MutPred

0.54

.;.;Loss of disorder (P = 0.0761);.;.;.;.;.;.;.;

MVP

0.94

MPC

2.2

ClinPred

1.0

GERP RS

5.5

Varity_R

0.73

gMVP

0.48

Mutation Taster

=2/98

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over